Open the Phone app
Tap Keypad
Enter `*67` before the phone number to hide your caller ID for one call
Go to Settings
Tap Phone
Tap Call Forwarding
Turn on Call Forwarding
Enter the number you want calls diverted to
Contact your carrier if Call Forwarding is not available
Use Do Not Disturb or Focus to silence incoming calls
Go to Settings
Tap Focus
Select a Focus mode
Turn it on
Allow calls only from selected contacts if needed